Sheet caliper control device for paper making



April 25, 1961 F. H. GOYETTE SHEET CALIPER CONTROL DEVICE FOR PAPERMAKING Filed Nov. 6, 1957 INVENTOR FRANCIS HENRY GOYETTE ATTORNEY SHEETCALIPER CONTROL DEVICE F PAPER MAKING Filed Nov. 6, 1957, set. No.694,886

10 Claims. Cl. 100-93 This invention relates to a new and improveddevice for controlling the quality of the sheet in paper-making, andtheprincipal object of the invention resides in the provision ofutilizing a support, as for instance for adoctor for a calender roll, asa frame for mounting a new and improved device extending across themachine in close proximity to and parallel to the roll, with means forselectivity directing either cold or heated air or other fluid to thesurface of the roll for, respectively, reducing an annular bulge in theroll or expanding an annular depression, to the end that the paper maybe made very uniform as to the thickness thereof across the entiresheet.

Further objects of the invention include the provision of a device asabove described including an elongated frame member for the doctor bladeand mounted thereon there are a pair of air chests, one for hot air andone for cold air, in combination with selectively operable valve meansfor directing either hot or cold air at spaced points across the rollfor the purpose above described; and the provision of a device as abovestated including very simple control means whereby the roll may beheated or cooled as desired at any particular location across themachine.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which- Fig. 1 isa view in section through the calender rolls showing a form of theinvention applied to one roll;

Fig. 2 is an elevational view, looking in the direction of arrow 2 inFig. 1; t

Fig. 3 is an enlarged section, taken along the line 3-3 of Fig. 1; a

Fig.4 is a fragmentary section illustrating the valve control in adifierent position;

Fig. 5 is a view similar to Fig. 1 showing a modification; and

Fig. 6 is a perspective view showing another modification.

In carrying out the present invention, the same is shown as applied-to acalender roll in a paper-making machine, one of these rolls beingindicated at 10. A doctor blade of the usual construction is indicatedat 14 and this is mounted on the usual supporting frame therefor 16. Asis well known, the frame 16 extends across the machine in closely spacedrelation to the roll and provides a support for the dactor blade whichoperates in the usual manner with respect to the rotational surface ofthe roll 10.

The invention in the present case resides in the provision of a pair ofparallel elongated superposed air chests which are separately indicatedat 18 and 28. In the form of the invention shown in Fig. 1, air chest 20is mounted on frame 16 and air chest 18 is mounted upon chest 20 throughthe interposition of a series of spaced, parallel, transverse valvebodies which are all alike and are indicated at 22. These valve bodiesare positioned,

in series across the machine and there may be as many as necessary. Aspacing of two to three inches has been found to be satisfactory.

The valve bodies 22 are welded at the top surface of air chest as isindicated at 24 in Fig. 3, but the top chest 18 is not rigidly securedto the valve bodies, merely resting thereon, and being held thereto byany convenient means as for instance dowel-pins 26. This is for thereason that the upper air chest 18 is adapted for hot air and the lowerchest 20 for cold air, and this construction provides against anyinterruptionor'damage due to expansion of metal parts under differencesin temperature.

Each valve body has an open-ended cylindrical hollow chamber, and eachchamber has a longitudinally slidable and rotatable hollow cylindricalvalve member or tube 28 which is provided with openings as at 30 forselective alignment or mis-alignment with passages 32 and 34 in thevalve body 32. In turn, passages 32'and 34 are aligned with apertures 36in the lower wall of the upper chamber 18 and apertures 38 in the upperwall of the 10. Since the roll 10 is rotating, this will provide anannular heated surface area on the roll by which means any indentationin the roll will be expanded so as to maintain a uniform nip pressureand thus the thickness of the sheet of paper across the entire widththereof will be kept uniform also.

If, on the other hand, the cylindrical valve member 28 should be rotatedas in Fig. 4, then the cold air will be led as shown by the arrows inthis figure to impinge upon the roll and thus contract the surfacesofthe roll annularly in order to deviate an annular bump or ringthereon.

The valve member 28 is provided with a handle 40 by which it may be thusmanipulated and if desired it may have a compression spring 12 mountedbetween the head and the outer end of the Valve body to normallymaintain the cylinder in a retracted position where none of theapertures 30 coincide with any of the other apertures, so that the valveis normally completely closed and does not cause fiow of either hot orcold air to the cylinder. Also, if desired, the handle 40 may beprovided with resilient notched bars 44 which tend to hold the same inthe position in which the handle is set, as is clearly illustrated inFigs. 1 and 4. This provides for adjustment of the amount of hot or coldair allowed to flow, for different degrees of caliper variation encountered.

A modification of the invention is shown in Fig. 5 wherein the doctorblade frame 50 is provided with an oppositely facing angle-iron 52, thusforming an air chest which may be either the hot or the cold air chest.By placing apertures 54in the position shown, the same valve member 28may be utilized in the manner as described above in the. same kind ofvalve body 22 having apertures as above described, etc. In this case thedowelpin 26 may also secure the same chest 18 as above described for thehot air and of course this chest will be provided with the apertures 36as has already been described. Otherwise the construction is the same asbefore and the operation of the device is the same as above described.

Patented Apr, 25, 1961 In Fig. 6 there is shown a hollow tubular valvemember 56' and in this case there is provided an elongated slot 58 whichcorresponds to those at 30. In this case, the valve member 56 may beadjusted longitudinally with respect to the apertures at 36 but thevolume of: fluid parts will not vary. In this case, the variation is thedistance between the open end or nozzle of the valve member 56 and theroll surface. By this means, the general effect of the fluid on the rollsurface may be varied merely by varying the distance of the valve devicefrom the roll surface.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claims, but what I claim is:

1. In a paper-making machine having a roll over which the paper inprocess passes and a doctor and doctor frame for the roll, thatimprovement which comprises a pair of fluid chests mounted on the doctorframe, a source of heated fluid connected to one chest, a source ofcooled fluid connected to the other chest, a series of valves for thechests, said valves extending in mutually spaced relation longitudinallyalong the roll, means to direct fluid from each chest to each valve tothe roll surface, and means to open and close each valve independentlyfor selective cooling or heating of the roll surface at selected points.

2. In a paper-making machine having a roll over which the paper inprocess passes and a doctor and doctor frame for the roll, thatimprovement which comprises a pair of fluid chests mounted on the doctorframe, a

source of heated fluid connected to one chest, a source 7 of cooledfluid connected to the other chest, said chests extending along thelength of the doctor frame, a series of valves for the chests, means todirect fluid from each chest to each valve to the roll surface, andmeans to open and close each valve independently for selective coolingor heating of the roll surface at selected points along the roll.

3. A sheet caliper control device for a calendering roll in apaper-making machine, said device comprising an elongated frameextendingalong the roll, a pair of fluid chests extending along the frame andmounted thereon in spaced relation to the roll, a series of valves forthe chests, each valve comprising a cylindrical tube arrangedtransvesrely of the chests and generally normal to the axis of the roll,the tubes being movable with respect to the chests and having aperturesselectively aligned or with or blocked with corresponding apertures inthe chests, and means for moving the tubes for directing fluid fromeither chest to the roll surface at will.

4. A sheet caliper control doctor for a roll of a papermaking machine,said doctor comprising a frame extending along the roll, a pair ofseparate fluid chests extending along the frame, a doctor blade on theframe, a series of longitudinaly spaced valves extending along thechests, means to operate the valve to selectively direct heated orcooled fluid from one chest or the other through any selected valve tothe roll surface at selected points along the roll for expanding orreducing the roll.

5. The doctor of claim 4 wherein the valves are located between thechests.

6. In a paper-making machine, having a roll, a sheet caliper controldevice, comprising a supporting frame arranged generally parallel to theroll in spaced relation thereto, a pair of conduits on the supportingframe extending along the same, a series of transversely positionedvalve devices, each valve device being arranged to direct fluid fromeither chest to the roll surface at selected points thereon, and sourcesof heated fluid and cooled fluid, each source being in communicationwith a separate chest.

7. The machine of claim 6 wherein each valve device includes a hollowcylinder open at an end thereof adjacent the roll and having selectivecommunication with a chest.

8. The machine of claim 6 wherein each valve device includes a hollowcylinder open at an end thereof adja cent the roll and having selectivecommunication with either chest.

9. The machine of claim 6 including means to adjust the valve devices toapproach or recede from the roll.

1.0. The machine of claim 6 wherein each valve device includes a hollowcylinder open at an end thereof adjacent the roll and having selectivecommunication with a chest, and means to longitudinally adjust thehollow cylinder to and from the roll for adjustment of the effect of thefluid on the roll.

References Cited in the file of this patent UNITED STATES PATENTS

